It wasn't white-knighting, you were just incorrectly using a meme and it came of as dick-ish.

"While the stereotypes about attention-seeking female gamers began to emerge with the popularization of online multiplayer games in the early 2000s, the earliest known use of “gurl gamer” as a derisive label can be found in a Gaia Online forum thread titled “I’m a girl gamer! GIRL GAMER PRIDE …Okay,” submitted by forum member Dimigo on January 24th, 2010" - Knowyourmeme

Remember, sarcasm doesn't generally carry well through text. There was genuinely no way for me (or anyone for that matter), to know if you were "joking" or just being a dick.

I'm not saying it's right, I'm saying that's what I (and everyone I know) do(es). The non-chocolatey cereals also tend to just make the milk taste far too sugary for my taste, which is not what I'm looking for when I drink milk.

Let's talk about the two guys behind him:
1. The guy on the phone: He is pretty clearly taking a video/picture. Whether it's of the game, or of the wave, I'm not sure. He also does not participate at all, which, if you read my comment, I'm fine with.
2. The other guy isn't terribly enthusiastic about the wave, but he still participates, raising both of his hands in the air at the proper time. That's some kind of effort, enough to earn at least a little respect. It also looks like he may be in a conversation with Phone Guy, which is also an excuse to not go all out.

I never said it was a crime, I just said it reflects on his character in a way that I don't like. The little smirk he tries to hide behind his hand at the end also doesn't help.